I also recommend serhazat's stories. You said softer and sensual so it might not be what you are looking for, but he created a world where everyone is female and addicted to tickling others mercilessly.
Because of that, as an inhabitant of that world, it is a given and fully expected that they will find themselves on the recieving end eventually, so even though most of the tickling is a battle between lee and ler, it is a different feel than most non-consensual stories because in his world it is a normal part of life. Highly recommend his stories.
Monster hunters actually describes my favorite character of all time. Catherine, a glutton for punishment who purposely puts herself into situations where she is tortured for days.